The Chicxulub Impactor (IMAGE) Harvard-Smithsonian Center for Astrophysics Caption Artist's rendering of a comet headed towards Earth. Credit Credit not required. This is a public domain image. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.